Scottish First Minister Nicola Sturgeon, who leads Scotland's devolved government, complained that her talks in London with British Prime Minister Theresa May on Monday were "deeply frustrating."

"I don't know any more about the Brexit negotiations than I did when I went in," the leader told television reporters following the talks in Downing Street.

Sturgeon had complained about talk of a so-called "hard Brexit," where Britain would seek to control immigration into the country, even if it meant losing unfettered access to the EU's single market.

The Scottish leader has instead called for a more "flexible Brexit" that would allow Scotland to retain access to the EU free trade bloc. 

One negotiating position

But that was dismissed Monday by May, who insisted that Britain must present a "single UK position" when negotiations with Brussels begin next year.

Instead, London will set up a committee to ensure thorough input from its three devolved nations over the UK's future relationship with Europe.

British voters decided by a narrow majority of 51.9 percent to leave, with 48.1 to remain in the EU on June 23, 2016. Turnout was 72 percent. London with 59 per cent, Scotland with 62 percent and Northern Ireland with 55 percent were the only areas that voted to remain in the EU in the referendum.

But Sturgeon warned May in a television interview: "the consequences of a hard Brexit for Scotland would be very severe and I'm not prepared to stand back and let that happen."

Sturgeon has launched a draft bill on a second referendum on independence from London, after a similar vote failed in 2014.

Warning to leaders

May called Monday's meeting to discuss what part Scotland, Northern Ireland and Wales would play in the Brexit process - the years-long negotiations that will see the UK leave the EU.

May's spokeswoman told reporters that the prime minister had warned the other leaders not to undermine the negotiations by conducting their own talks with Brussels.  The government has said it will trigger Article 50, formally launching exit talks with the EU, by the end of March.

Constitutional crisis?

Experts have warned of the risk of a constitutional crisis if May does not take into account the position of each of the UK's four nations - including England - when conducting negotiations on the terms of Brexit.

As well as Scotland's concerns, there are also fears that Brexit could undermine a 1998 peace deal in Northern Ireland that could reinstate a hard border with the Republic of Ireland.

Welsh First Minister Carwyn Jones has called for votes in the regional assemblies as well as the Westminster parliament on the UK's negotiating position.

mm/jm (AFP, Reuters)